<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%=request.getRequestURL() %>完整的路径
<br/><%=request.getRequestURI() %>project servlet path xxx
<br/><%=request.getContextPath()%>//工程路径
<br/><%=request.getServletPath() %>//servlet路径
<br/><%=request.getQueryString() %>url=xxxxx？后面的部分
<br/><% application.getRealPath(request.getRequestURI()); %>//文件的真实路径
<br/><%=application.getRealPath("/")%>
</body>
</html>